RocketLinx ES8108 Series Installation Overview

Use the following overview to install the ES8108 series. All models are referred to as the ES8108 unless a procedure is specific to a specific model.


See the ES8108-GigE page if you are installing a ES8108-GigE.

Wire the Power Inputs (PW1 and PW2)

The ES8108 supports power redundancy and reverse polarity protection with dual power inputs. If both power inputs are connected, the ES8108 is powered from the highest connected voltage. Positive and negative power system inputs are both accepted but PW1 and PW2 must apply the same mode.


Recommended Working Voltage

Serial numbers less than 1000: 12 to 48VDC

Serial numbers greater than 1000: 10 to 60VDC.

You can refer to the label on the ES8108, which also displays the recommended working voltage and serial number.

If this is a Restricted Access Location installation, make sure that the power supply is in compliance with a UL certified LPS (limited power source) and the power system is shutdown to avoid any damage while connecting the power.Power Terminal

  1. Unplug the power terminal block before making the wire connections, otherwise the screwdriver can inadvertently short the terminal connections to the grounded enclosure.

  2. Insert the wires (12-24 AWG) from the power supply into the terminal block connector contacts.

  3. Tighten the wire-clamp screws to prevent the wires from becoming loose.

Wire the Relay Alarm Output

The ES8108 alarm relay can be connected to provide port link and power events notifications. The relay contacts are normally open and remain open when there is no failure event. The relay contacts will close when there is a failure event to notify.

Power Terminal

The failure events are selectable and enabled using the DIP switch on the ES8108.


Maximum Alarm Relay Contact

Serial numbers less than 1000: 1A at 24VDC

Serial numbers greater than 1000: 0.5A at 24VDC.

Refer to the label on the ES8108 for the serial number.

Connect Ground

Connect a ground wire between the chassis and earth ground using 12-24AWG wire to ensure that the ES8108 is not damaged by noise or electrical shock.

If you are going to mount the ES8108 on a grounded DIN rail, you do not need to also connect the ground wire.

Set the DIP Switch

Use this information to set the event alarm DIP switch.

DIP Switch

Use this table to set the DIP switch for the relay output alarm.

DIP SwitchStatusDescription
1 through 8



Enables the port link down alarm for the corresponding port.

Disables the power link down alarm for the corresponding port.




Enables the power failure alarm.

Disables the power failure alarm.

Mount the ES8108

You can use these steps to mount the ES8108.

  1. Insert the upper end of DIN rail clip into the back of DIN rail track from its upper side.

  2. Lightly push the bottom of DIN rail clip into the track.

  3. Verify that the DIN rail clip is tightly attached on the track.Mounting

To remove the ES8108 from the track, reverse the steps above.

Connect RJ45 Ports

Connect standard Ethernet cables between the ES8108 Ethernet ports and the network nodes.

The Fast Ethernet ports support 10BASE-T and 100BASE-TX, full- or half-duplex modes. All of the Fast Ethernet ports automatically detect the signal from the connected devices to negotiate the link speed and duplex mode. Auto MDI/MDIX allows you to connect another switch, hub, or workstation without changing straight-through or crossover cables. Crossover cables cross-connect the transmit lines at each end to the received lines at the opposite end.


Always make sure that the cables between the switch and attached devices (for example, switch, hub, or workstation) do not exceed 100 meters (328 feet).

  • 10BASE-T: Category 3, 4, or 5 cable

  • 100BASE-TX: Category 5 cable

Connect the Fiber Ports

If you are installing a ES8108F or ES8108F-XT, connect the fiber port.

The fiber connector is a standard connector or square connector (SC).


This is a Class 1 laser/LED device. Do not stare into the laser/LED beam.

A wrong connection will cause the fiber port not to work properly.



You can use this table for information about the ES8108 LEDs.

PWR1/PWR2PoweredNo power
ALM (Alarm)Port link is down or a power failure event has occurredRelay not activated or not fault condition has occurred

Port 1-8


Port 1-6


A green lit LED indicates that a network device is detected and linked up.

A yellow lit LED indicates that a network device is detected and link established at 100Mbps

If the green Link LED is lit and the yellow speed LED is off, a network device is detected and a link has been established at 10Mbps.

Both green and yellow LEDs are not lit a port link has not been established.

Fiber Ports 7-8


A green lit LED indicates that a network device is detected and a link has been established at 100Mbps.No active link

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